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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: scroll-start-target*</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start-target">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<style>
#scroller {
height: 500px;
width: 500px;
display: block;
overflow: scroll;
writing-mode: vertical-rl;
}
.box {
position: relative;
width: 60%;
height: 60%;
}
.top_right {
top: 0px;
left: 0px;
background-color: red;
}
.center {
top: 60%;
background-color: purple;
scroll-start-target: auto auto;
}
.bottom_left {
top: 120%;
background-color: yellow;
}
</style>
<div id="scroller">
<div class="top_right box" id="box1"></div>
<div class="center box" id="box2"></div>
<div class="bottom_left box" id="box3"></div>
</div>
<script>
let initial_expected_scroll_top = box1.getBoundingClientRect().height;
let initial_expected_scroll_left = -box1.getBoundingClientRect().width;
test((t) => {
assert_equals(scroller.scrollTop, initial_expected_scroll_top,
"scroller is vertically scrolled to scroll-start-target");
assert_equals(scroller.scrollLeft, initial_expected_scroll_left,
"scroller is horizontally scrolled to scroll-start-target");
}, "scroll-start-target reflects vertical rtl writing mode.");
</script>
</body>
</html>
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